Hypercritically enhanced distortion of a phase diagram: the (polystyrene + acetaldehyde) system

Luís P. N. Rebelo, Hermínio C. De Sousa, W. Alexander Van Hook

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


We report new experimental evidence of the existence of double critical points in a binary system. Pressure-temperature data on the solubility of (polystyrene + acetaldehyde) were obtained using a low-angle light-scattering technique. Phase diagrams change from an UCST/LCST configuration showing a marked double maxima to an hour-glass shape with a "window of miscibility" as pressure decreases. Successful modeling of these unusual shapes was achieved by using a computation algorithm which incorporates a temperature- and concentration-dependent interaction parameter.

Original languageEnglish
Pages (from-to)631-637
Number of pages7
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number4
Publication statusPublished - 1 Jan 1997


  • Generalized Flory-Huggins model
  • Hypercritical
  • Liquid-liquid demixing
  • Polymer solutions
  • Pressure effects


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